Improvement in treadles for sewing-machines



A. NIELSON. TREADLE FOR SEWING MACHINES.

N0.109,835. Patented Dec! 6, 1870.

damn dtiffini.

ALFREDNIELSON, OF BROOKLYN, NEW YORK.

Letters Patent No.109,835, dated December 6, 1870.

IMPROVEMENT IN TREADLES FOR SEWING-MACHINES.

the Schedule "(mod to in time Letters Patent and making part. of the name.

To all whom may concern Be it known that I, ALFRED Ninnsox, of Brooklyn, Kings county, and State of New York, have invented certain new and useful Improvements in Mechanism for Checking the Backward Motion of Treadles in Sewing and other Machines; and I do hereby declare that the following is a full description ofthc same.

The nature of my invention consists in combining with the pulley-wheel a loosely-working crank-lever having its center-pin eccentric to the axis of the pulley-wheel, and a cam or stop formed on the inner.

edge of the crank-lever eye, so as to jam or bind against the stationary axis of the pulley-wheel whenever abnckward motion is attempted tobe given to the pulley-wheel also, in making the crank-lever of a bent 01' curved form, so that the crank-rod pin will be nearly on the opposite side of the pulley-axis from that of the crank-lever ccntcrpin, and confining it within a countersunk recess in the face of thepullcywheel, or by a stop-pin in the face of the pulley, so as to form a bearing for the end of the. crank-lever to bear against when rotating the pulley. But

To describe my invention more particularly, I will refer to the accompanying drawing forming a part of this specification, the same letters of reference, whereever they occur, referring to like parts.

Figure 1 is a representation of the invention as applied to my improved treadlc.

Figure 2 is a representation of the same as applied Letter-A represents the pulley-wheel of a sewing or other machine, rotated by a treadlc-motion.

B is the axis or center-pin on which it rotates, and having its end project a little distencc beybnd the face of the pulley. The object of this ismaterial to-the successful operation of my invention. This is due to the fact that it is stationary and the pulley rotates upon it, and therefore becomes a point of resistance or stud, against which the movable crank G can operate to stop the machine.

This movable crank is bent so as to form a small irregularsegmcnt of a circle of perhaps a third of a circle. This precise length is notan absolute condition, but may be varied, if desired. The adjustment of it is eccentric to the center-pin on which the pulley runs, and by means of a pin, D, secured to the face ofthe pulley at whatever point intended for the vibration of the treadle.

On the eye of the crank is formed a cam-like enlargement on its under. side, as shown at-E, figs. 3, 4,

and 6, and is intended, when the crank is secured to the face of the pulley, to be in near cont-act'with the end of the pulley center-pin, but not touch it, elvcept when the pulley is attempted to be run backward, as shown in fig. 4, when the bulging portion of the eye jams against the stationary center-pin of the pulleywheel and stops its motion.

in the forward motion of the pulley-wheel, as shown in fig. 3, the crank-pin end F is thrown back against the countersunk ledge G, formed in the face of the pulley, (or any simple stop-pin in place of the countersunk ledge answers the same purpose,) and thus causes the pulley to rotate by releasing the cam from its contact with the pulley center-pin.

Letter H represents the roadie-motion, as patented by me October 11, 1870, applied to rotate the pulley.

It will be obvious that the ordinary t-rcadlcmotion and connecting-rod is equally as well adapted to operate and rotate the pulley, and therefore I do not limit my invention to any particular treadle-motion, andhave only shown it in connection with my previous invention of an improved treadlc as one of theways in which it may be used, and for showing its mode of operation by a practical application of it.

Having now described my invention, I will proceed to setforth what I claim and desire to secure by Letters Patent of the United States.

I claim- 1. The crank-lcver-O, having a cam or stop, E, on its shank or inner edge, substantially as described, in combination with a pulley-wheel, A, having a countersunk ledge, G, or equivalent device, in or upon its face, substantially as set forth.

2. The crank-lever 0, having the caiuE thereon, as set forth, in combination with the stationary axis B of the pulley-wheel A, when projecting beyond the face of the puiley-wheehso as to form a fixed bearing for the cam E to jam against to stop any backward motion of the pulley-wheel, as hereinbefore described.

' ALFRED NIELSON.

Witnesses:

CHARLES L. B'smucrr,

FRANKLIN BARRITT. 

